In individuals, insanity is rare; but in groups, parties, nations and epochs, it is the rule. Friedrich Nietzsche
I think stablecoins are a more advanced payment mechanism rather than a true cryptocurrency. Therefore, I think Walmart is trying to develop a better payment application for fiat currency rather than an altcoin.
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Consequently , you can argue Bitcoin has no value in the real world. To clarify, you cannot take Bitcoin; or Steem (STEEM), down the supermarket and buy food for your kids with it. Furthermore, I cannot imagine grocery giants; like Walmart (NYSE: WMT), Kroger (NYSE: KR), Tesco (LSE: TSCO), Aldi, or Carrefour, accepting Bitcoin at their registers.
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